RuntimeError: Not implemented mypy.types.TypeGuardedType

[gopidesupavan]

Bug Report
Getting error RuntimeError: ('Not implemented', <class 'mypy.types.TypeGuardedType'>)

(A clear and concise description of what the bug is.)

To Reproduce
Interestingly i cant reproduce with the below one.

from typing import Any, TextIO, TypeAlias, TypeVar, TYPE_CHECKING,
if TYPE_CHECKING:
    from airflow.typing_compat import TypeGuard
V1EnvVar = TypeVar("V1EnvVar")
Redactable: TypeAlias = str | V1EnvVar | dict[Any, Any] | tuple[Any, ...] | list[Any]
@cache
def _get_v1_env_var_type() -> type:
    try:
        from kubernetes.client import V1EnvVar
    except ImportError:
        return type("V1EnvVar", (), {})
    return V1EnvVar


def _is_v1_env_var(v: Any) -> TypeGuard[V1EnvVar]:
    return isinstance(v, _get_v1_env_var_type())

But when i execute the https://github.com/apache/airflow/blob/main/task-sdk/src/airflow/sdk/execution_time/secrets_masker.py am getting the runtime error.

Traceback (most recent call last):
  File "/usr/local/bin/mypy", line 10, in <module>
    sys.exit(console_entry())
  File "mypy/build.py", line 2062, in wrap_context
  File "mypy/build.py", line 2391, in finish_passes
  File "mypy/build.py", line 2424, in _patch_indirect_dependencies
  File "mypy/indirection.py", line 35, in find_modules
  File "mypy/indirection.py", line 46, in _visit
  File "mypy/types.py", line 276, in accept
RuntimeError: ('Not implemented', <class 'mypy.types.TypeGuardedType'>)
task-sdk/src/airflow/sdk/execution_time/secrets_masker.py: : note: use --pdb to drop into pdb

Expected Behavior

Actual Behavior

Your Environment

• Mypy version used: 1.16.1
• Mypy command-line flags: mypy task-sdk/src/airflow/sdk/execution_time/secrets_masker.py
• Mypy configuration options from mypy.ini (and other config files):
• Python version used: 3.10

[sterliakov]

This passes on current master and bisects to the merge commit of #19183.

@ilevkivskyi could you please take a look? I feel like that PR only fixed this issue accidentally and does not resolve the root cause, but would love to be proven wrong!

[hauntsaninja]

Is probably same as this comment: #19183 (comment)

[ilevkivskyi]

Yeah, that is a valid fix for this case. No need to keep this open.